Simulate VM behavior wrt open receive ports.

compiler/lib/implementation/isolate.js

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 var isolate$current = null;
 var isolate$rootIsolate = null;  // Will only be set in the main worker.
 var isolate$inits = [];
 var isolate$globalThis = this;
 
 // These declarations are needed to avoid errors from the Closure Compiler
@@ skipping 370 matching lines @@
   isolate$mainWorker.postMessage( { command: 'close' } );
 }
 
 function isolate$doOneEventLoopIteration() {
   var CONTINUE_LOOP = true;
   var STOP_LOOP = false;
   var event = isolate$IsolateEvent.dequeue();
   if (!event) {
     if (isolate$inWorker) {
       isolate$closeWorkerIfNecessary();
-    } else if (!isolate$isolateRegistry.isEmpty() &&
+    } else if (isolate$isolateRegistry.get(isolate$rootIsolate.id) &&

[kasperl, 2011/11/03 13:16:00]

I would compare this against null.

[floitsch, 2011/11/03 13:28:53]

added .contains method.

                isolate$workerRegistry.isEmpty() &&
                !isolate$supportsWorkers && (typeof(window) == 'undefined')) {
-      // This should only trigger when running on the command-line.
-      // We don't want this check to execute in the browser where the isolate
-      // might still be alive due to DOM callbacks.
-      // throw Error("Program exited with open ReceivePorts.");
+      // No events anymore, but the main-worker still has open receive-ports.
+      // This simulates the VM's behavior (which instead times out).
+      // We only trigger this message when we run on the console (where we
+      // don't have workers). We don't want this check to execute in the browser
+      // where the isolate might still be alive due to DOM callbacks.
+      throw Error("Program exited with open ReceivePorts.");
     }
     return STOP_LOOP;
   } else {
     event.process();
     return CONTINUE_LOOP;
   }
 }
 
 function isolate$doRunEventLoop() {
   if (typeof window != 'undefined' && window.setTimeout) {
@@ skipping 99 matching lines @@
 }
 
 function isolate$deserializeMessage(message) {
   if (isolate$useWorkers || isolate$useWorkerSerializationProtocol) {
     return native__IsolateJsUtil__deserializeMessage(message);
   } else {
     // Nothing more to do.
     return message;
   }
 }